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Optics & Laser Technology

Fiber diamond-based quantum sensor for high-precision current sensing

Yuhao Li, Haoliang Hu, Ziyang Zhu, Feng Zhou, Yu Lei, Junchang Huang, Qi Nie, Li Xia

Published Jul 1, 2025• 6 citations
Publisher
DOI
10.1016/j.optlastec.2025.113356

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Negatively charged nitrogen-vacancy (NV) centers in diamond have been extensively studied as a promising high sensitivity solid-state magnetic field sensor at room temperature. However, their use for current sensing applications is limited due to the challenge of integration and miniaturization of the diamond NV sensor. Here, we demonstrate an integrated NV sensor fabricated with standard microfabrication process. The sensor device incorporated with a toroidal magnetic yoke enables a high-precision wide range direct current sensing with galvanic isolation. The performance of the diamond NV current sensor in an open loop configuration has been investigated. A current measuring range of 0 A ~ 1000 A with an uncertainty of 46 ppm are achieved. Taking advantage of dual spin resonance modulation, temperature drift is suppressed to 10 ppm/K. This configuration opens new possibilities as a robust and scalable platform for current quantum sensing technologies.